version 1.2, 2001/05/03 22:54:12
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version 1.76, 2006/09/05 17:33:11
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# The LearningOnline Network with CAPA |
# The LearningOnline Network with CAPA |
# TeX Conversion Module |
# TeX Conversion Module |
# |
# |
# 05/29/00,05/30,10/11,10/20 Gerd Kortemeyer |
# $Id$ |
# 05/03/2001 Scott Harrison |
# |
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# Copyright Michigan State University Board of Trustees |
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# |
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# This file is part of the LearningOnline Network with CAPA (LON-CAPA). |
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# |
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# LON-CAPA is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# LON-CAPA is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with LON-CAPA; if not, write to the Free Software |
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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# |
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# /home/httpd/html/adm/gpl.txt |
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# |
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# http://www.lon-capa.org/ |
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# |
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# Copyright for TtHfunc and TtMfunc by Ian Hutchinson. |
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# TtHfunc and TtMfunc (the "Code") may be compiled and linked into |
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# binary executable programs or libraries distributed by the |
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# Michigan State University (the "Licensee"), but any binaries so |
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# distributed are hereby licensed only for use in the context |
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# of a program or computational system for which the Licensee is the |
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# primary author or distributor, and which performs substantial |
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# additional tasks beyond the translation of (La)TeX into HTML. |
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# The C source of the Code may not be distributed by the Licensee |
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# to any other parties under any circumstances. |
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# |
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package Apache::lontexconvert; |
package Apache::lontexconvert; |
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use strict; |
use strict; |
use tth; |
use tth(); |
use vars qw($errorstring); |
use vars qw($errorstring); |
use Apache::lonmsg; |
#use Apache::lonxml(); |
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use Apache::lonlocal; |
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use Apache::lonnet; |
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use lib '/home/httpd/lib/perl/'; |
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use LONCAPA; |
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# ====================================================================== Header |
# ====================================================================== Header |
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sub header { |
sub init_tth { |
$errorstring=''; |
my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'}; |
my $time=time; |
if ($options =~ /\S/) { |
my $addhead=<<END; |
$options = ' '.$options; |
<script language="JavaScript"> |
} else { |
if (window.location.pathname!="/res/adm/pages/menu.html") { |
undef($options); |
menu=window.open("","LONCAPAmenu"); |
} |
menu.currentURL=window.location.pathname; |
if ($env{'browser.mathml'}) { |
} |
&tth::ttminit(); |
</script> |
if ($env{'browser.unicode'}) { |
END |
&tth::ttmoptions('-L -u1'.$options); |
if ($ENV{'browser.mathml'}) { |
} else { |
&tth::ttminit(); |
&tth::ttmoptions('-L -u0'.$options); |
return '<?xml version="1.0"?>' |
} |
.'<?xml-stylesheet type="text/css" href="/adm/MathML/mathml.css"?>' |
} else { |
.'<!DOCTYPE html SYSTEM "/adm/MathML/mathml.dtd" ' |
&tth::tthinit(); |
.'[<!ENTITY mathns "http://www.w3.org/1998/Math/MathML">]>' |
if ($env{'browser.unicode'}) { |
.'<html xmlns:math="http://www.w3.org/1998/Math/MathML" ' |
&tth::tthoptions('-L -u1'.$options); |
.'xmlns="http://www.w3.org/TR/REC-html40">' |
} else { |
."<head>$addhead</head>" |
&tth::tthoptions('-L -u0'.$options); |
."\n"; |
} |
} else { |
} |
&tth::tthinit(); |
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my $headerstring='<html>'; |
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if ($ENV{'browser.os'} eq 'mac') { |
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$headerstring.="<head>\n" |
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.'<meta Content-Type="text/html; charset=x-mac-roman">' |
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."\n$addhead</head>\n"; |
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} |
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else { |
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$headerstring.="<head>$addhead</head>"; |
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} |
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return $headerstring."\n"; |
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} |
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} |
} |
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# ================================================================== Conversion |
# ================================================================== Conversion |
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sub converted { |
$Apache::lontexconvert::messedup=0; |
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# we need this routine because &converted can get called from inside |
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# of the safespace (through &xmlparse('<m>stuff</m>') which doesn't |
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# allow the opcode for alarm, so we need to compile this before we get |
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# into the safe space since opcode checks only occur at compile time |
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sub convert_real { |
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my ($texstring)=@_; |
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my ($xmlstring,$errorstring); |
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local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; }; |
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local $SIG{ALRM}=sub { |
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&Apache::lonnet::logthis("ALRM"); |
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$xmlstring='['.&mt("TeX unconverted due to errors").']'; |
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$Apache::lontexconvert::messedup=1; |
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die &mt("TeX unconverted due to errors"); |
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}; |
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&Apache::lonxml::start_alarm(); |
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if ($env{'browser.mathml'}) { |
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$xmlstring=&tth::ttm($$texstring); |
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$xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g; |
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$xmlstring=~s/\<br\>/\<br\/\>/g; |
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$xmlstring=~s/\<p\>/\<p\>\<\/p\>/g; |
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$errorstring.=&tth::ttmerror(); |
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} else { |
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$xmlstring=&tth::tth($$texstring); |
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$errorstring.=&tth::ttherror(); |
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$xmlstring=~s-</font(\s*)>-</font>-g; |
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} |
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$xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s; |
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$xmlstring=~s/^\s*//; |
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$xmlstring=~s/\s*$//; |
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&Apache::lonxml::end_alarm(); |
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return ($xmlstring,$errorstring); |
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} |
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sub tth_converted { |
my $texstring=shift; |
my $texstring=shift; |
my $xmlstring; |
my $xmlstring='['.&mt('UNDISPLAYABLE').']'; |
if ($ENV{'browser.mathml'}) { |
if ($Apache::lontexconvert::messedup) { |
$xmlstring=&tth::ttm($$texstring); |
return '['.&mt('TeX unconverted due to previous errors').']'; |
$xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g; |
} |
$xmlstring=~s/\<br\>/\<br\/\>/g; |
$$texstring ='\\documentstyle{article}'.$$texstring; |
$xmlstring=~s/\<p\>/\<p\>\<\/p\>/g; |
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$errorstring.=&tth::ttmerror(); |
eval(<<'ENDCONV'); |
} else { |
($xmlstring,$errorstring)=&convert_real($texstring) |
$xmlstring=&tth::tth($$texstring); |
ENDCONV |
$errorstring.=&tth::ttherror(); |
if ($@) { |
} |
$errorstring.=&mt("Evaluation Error: ").$@; |
return $xmlstring; |
$Apache::lontexconvert::messedup=1; |
} |
} |
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if ($Apache::lontexconvert::messedup || &tth::tthmessedup() || |
# ====================================================================== Footer |
$errorstring) { |
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&Apache::lonnet::logthis("Trying to kill myself"); |
sub footer { |
$Apache::lontexconvert::messedup=1; |
my $xmlstring=''; |
if (ref($Apache::lonxml::request)) { |
if ($ENV{'request.state'} eq 'construct') { |
$Apache::lonxml::request->child_terminate(); |
$xmlstring.='<address>'.$errorstring.'</address>'; |
} else { |
} else { |
my $request; |
&Apache::lonmsg::author_res_msg($ENV{'request.filename'},$errorstring); |
eval { $request=Apache->request; }; |
} |
if (!$request) { |
# -------------------------------------------------------------------- End Body |
eval { $request=Apache2::RequestUtil->request; }; |
$xmlstring.='</html>'; |
} |
return $xmlstring; |
if ($request) { |
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$request->child_terminate(); |
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} else { |
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&Apache::lonnet::logthis("Unable to find a request to do child_terminate on"); |
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} |
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} |
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} |
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return $xmlstring; |
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} |
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sub clean_out_math_mode { |
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my ($texstring)=@_; |
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$$texstring=~s/(?!\\)\$//g; |
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$$texstring=~s/\\[\)\(\]\[]//g; |
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$$texstring=~s/\\ensuremath//g; |
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return ''; |
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} |
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sub displaystyle { |
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my ($texstring)=@_; |
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#has a $$ or \[ or \displaystyle in it, guessinng it's display mode |
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if ($$texstring=~/[^\\]\$\$/ || |
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$$texstring=~/\\\[/ || |
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$$texstring=~/\\displaystyle/) { return 1; } |
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return 0; |
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} |
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sub jsMath_converted { |
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my $texstring=shift; |
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my $tag='span'; |
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if (&displaystyle($texstring)) { $tag='div'; } |
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&clean_out_math_mode($texstring); |
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return &jsMath_header(). |
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'<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>'; |
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} |
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{ |
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my @jsMath_sent_header; |
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sub jsMath_reset { |
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undef(@jsMath_sent_header); |
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} |
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sub jsMath_push { |
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push(@jsMath_sent_header,0); |
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} |
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sub jsMath_header { |
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return '' if $jsMath_sent_header[-1]; |
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$jsMath_sent_header[-1]=1; |
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return |
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'<script type="text/javascript"> |
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function NoFontMessage () {} |
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</script>'."\n". |
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'<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n"; |
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} |
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sub jsMath_process { |
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my $state = pop(@jsMath_sent_header); |
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return '' if !$state; |
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return '<script type="text/javascript">jsMath.Process()</script>'; |
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} |
} |
} |
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sub init_math_support { |
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&init_tth(); |
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&Apache::lontexconvert::jsMath_push(); |
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if ($env{'environment.texengine'} eq 'jsMath' || |
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$env{'form.texengine'} eq 'jsMath' ) { |
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return &Apache::lontexconvert::jsMath_header(); |
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} |
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return; |
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} |
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sub mimetex_converted { |
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my $texstring=shift; |
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my $displaystyle=&displaystyle($texstring); |
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&clean_out_math_mode($texstring); |
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if ($displaystyle) { |
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$$texstring='\\displaystyle \\Large '.$$texstring; |
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} |
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my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" />'; |
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if ($displaystyle) { |
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$result='<center>'.$result.'</center>'; |
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} |
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return $result; |
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} |
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sub converted { |
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my ($string,$mode)=@_; |
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if ($mode eq '') { $mode=$env{'environment.texengine'}; } |
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if ($mode =~ /tth/i) { |
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return &tth_converted($string); |
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} elsif ($mode =~ /jsmath/i) { |
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return &jsMath_converted($string); |
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} elsif ($mode =~ /mimetex/i) { |
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return &mimetex_converted($string); |
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} |
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return &tth_converted($string); |
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} |
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# ------------------------------------------------------------ Message display |
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sub to_convert { |
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my ($string) = @_; |
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$string=~s/\<br\s*\/?\>/ /gs; |
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# $string=~s/\s/ /gs; |
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$string=&HTML::Entities::decode($string); |
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return &converted(\$string); |
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} |
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sub smiley { |
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my $expression=shift; |
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if ($env{'browser.imagesuppress'} eq 'on') { return $expression; } |
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my %smileys=('\:\-\)' => 'smiley', |
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'8\-\)' => 'coolsmile', |
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'8\-(I|\|)' => 'coolindiff', |
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':\-(I|\|)' => 'neutral', |
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'\:\-(o|O|\(\))' => 'shocked', |
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':\-\(' => 'frowny', |
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'\;\-\)' => 'wink', |
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'\:\-P' => 'baeh', |
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'\:\-(\\\|\\/)' => 'hrrm', |
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'\:\-D' => 'bigsmile', |
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'\:\-C' => 'angry', |
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'\:(\'|\`)\-\(' => 'cry', |
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'\:\-(X|\#)' => 'lipsrsealed', |
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'\:\-S' => 'huh'); |
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my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'}; |
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foreach (keys %smileys) { |
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$expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs; |
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} |
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return $expression; |
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} |
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sub msgtexconverted { |
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my ($message,$email) = @_; |
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$errorstring=''; |
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&init_tth(); |
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my $outmessage=''; |
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my $tex=0; |
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foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) { |
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if ($tex) { |
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if ($email) { |
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$outmessage.='</pre><tt>'.&to_convert($_).'</tt><pre>'; $tex=0; |
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} else { |
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$outmessage.=&to_convert($_); $tex=0; |
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} |
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} else { |
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$outmessage.=&smiley($_); $tex=1; |
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} |
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} |
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$message=$outmessage; $outmessage=''; $tex=0; |
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foreach (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,$message)) { |
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if ($tex) { |
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if ($email) { |
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$outmessage.='</pre><tt>'.&algebra($_,'web').'</tt><pre>'; $tex=0; |
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} else { |
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$outmessage.=&algebra($_,'web'); $tex=0; |
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} |
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} else { |
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$outmessage.=$_; $tex=1; |
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} |
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} |
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if (wantarray) { |
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return ($outmessage,$errorstring); |
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} else { |
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return $outmessage.$errorstring; |
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} |
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} |
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sub algebra { |
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use AlgParser; |
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my ($string,$target,$style)=@_; |
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my $parser = new AlgParserWithImplicitExpand; |
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$string=&prepare_algebra($string); |
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my $ret = $parser->parse($string); |
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my $result='['.&mt('Algebra unconverted due to previous errors').']'; |
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if ( ref($ret) ) { |
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#$parser->tostring(); |
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$parser->normalize(); |
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my $latex=$parser->tolatex(); |
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$latex=&postprocess_algebra($latex); |
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if ($style eq 'display') { |
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$latex='$$'.$latex.'$$x'; |
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} else { |
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# style is 'inline' |
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$latex='\\ensuremath{'.$latex.'}'; |
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} |
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if ($target eq 'web' || $target eq 'analyze') { |
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$result = &converted(\$latex); |
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} else { |
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$result = $latex; |
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} |
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} else { |
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&Apache::lonxml::error($parser->{'htmlerror'}); |
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} |
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} |
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sub prepare_algebra { |
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my ($string)=@_; |
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# makes the decision about what is a minus sign easier supposedly |
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$string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g; |
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return $string; |
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} |
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sub postprocess_algebra { |
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my ($string)=@_; |
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# moodle had these and I don't know why, ignoring them for now |
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# $string =~s/\\fun/ /g; |
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# remove the extra () in the denominator of a \frac |
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$string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs; |
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# sqrt(3,4) means the 4 root of 3 |
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$string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs; |
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# log(3,4) means the log base 4 of 3 |
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$string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs; |
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# log(3,4) means the log base 4 of 3 |
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$string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs; |
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# int(3,a,b) integral from a to b of 3 |
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$string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs; |
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# int( ... dx) -> ... |
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$string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs; |
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# |
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$string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs; |
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return $string; |
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} |
1; |
1; |
__END__ |
__END__ |
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